eewett



(No Model.)

W/TNESSES 3 Sheets-Sheet 1.

R. HEWETT.

BOILER.

Patented Feb. 19, 1889.

' INVENTOH,

ATTORNEYS,

(No ModeL) 3 Sheets- Sheet 2.

R. W. HEWETT.

- BOILER. I NO. 397,915. I PZH'AiIlGEdv Feb. 19, 1889.

FIG 2 3 SheetS-Sheet 3.

(No Model.)

R. W. HEWET'T.

BOILER.

No. 397,915. Patented Feb. 19, 1889.

W E n m A n N. PETERS. PhulaLilhegl-n phar, Withinglom D, C.

NiTEn STATES PATENT EErcE.

BOILER.

SPECIFICATION forming part of Letters Patent No. 397,915, dated February 19, 1889. Application filed December 1, 1887. Serial No. 256,672. (No model.) Patented in England June 11, 1886, No. 7,778.

1'0 all whom, it may concern.-

Be it known that I, REGINALD WALTER I-IEWETT, manufacturer, a subject of the Queen of Great Britain, residing at Birmingham, in the county of IVarwick and Kingdom of Great Britain, have invented certain new and usef ul Improvements in Boilers, (for which I have obtained a patent in England June 11, 1886, No. 7 ,7 78;) and I do hereby declare that the following is a sufficient description of the invention to enable those skilled in the art to which it appertains to carry the same into practical effect.

My invention relates principally to the manner inwhich I construct and arrange combustion chambers for steam-generators for steam-boilers, whereby greater heatingsurface is obtained, and thus a great saving of fuel effected, besides many more advantages, which. will be obvious.

The mode of carrying my invention. into practical effect is as follows: I arrange combustion-chambers of any suitable form (usually that of circular tubing arranged vertically) through and within the boiler, with a branch piece or pieces placed between the extremities, and this branch piece (or pieces) is continued in suitable directions through the water-space and ultimately through the shell. of the boiler where convenient. The vertical tubing, before mentioned, below the branch piece being the chamber to contain the fuel for combustion, the upper parti. e., above the branch piece-serves as an ingress for the fuel, which may be fed by a hopper made air-tight. The fuel being fed falls down these tubes upon a movable perforated baseplate at the lower extremities, which serves for the inlet of the air or gases for supporting the combustion and egress of the remains of combustion or ashes. Combustion takes place right up to the branch piece, through which the consumed air or gases pass. By this means a line of burning fuel is maintained in the tube or tubes from the perforated base-plate to the region of the branch piece or pieces, which are of course placed at a suitable distance below the water-line of the boiler. It will be observed that all the air or gases which go to support combustion pass through the fuel, and not any being able to pass over the fuel, and thus the whole is utilized, and the fire is in direct contact with the said tubing internally and externally with the water in the boiler. Therefore the heating depends on the red-hot fuel, and not so much on the hot air or gases, as is usual in steam-boilers.

To promote a good combustion, I employ a current of air to create a forced draft by means of a connection made to a mechanical exhauster, as set forth and claimed in my specification, Serial No. 22934.4, for which I have obtained Letters Patent No. 376,822.

It will be seen that the number of combus tion-chambers necessary to the full effect desired would be decided by the size and horsepower of the boiler in. which they are to be employed. 'here more than one combnstion-chamber is used, the branch pieces may be united and the consumed air or gases conveycd through the one continued piece and ultimately through the shell of the boiler, although this method of uniting the branch pieces is not absolutely necessary, as they could each be separate, according to circumstances or design.

My invention is illustrated in the accompanying drawings, in which- Figure 1 is a part sectional elevation. Fig. 2 is a sectional plan upon line A B, and Fig. 3 is a similar plan upon line C D. Fig. 4: is a vertical cross-section taken through the center of Fig. 1.

Now referring to the drawings, E is a circular or other air-tight tank, which is kept filled with coke or any suitable fuel through sliding doors or lids c and c and this suitable fuel falls down the tubes F until it reaches the bottom of them. WVe will suppose that the boiler is filled with water and ready for firing. By holding a lighted brand beneath. the perforated plate J at the bottom of the fines F, and giving a few turns to a blower or fanconnected with the air-chamber G, a brisk fire is at once kindled, and in a very short time the whole lengths of the fines are in a blaze.

It will be seen that the air travels through the perforated plate J up through the fuel Ioe IO taehed, so that they ean be moved lmekward andthrongh thelwanehpieees ll (seen clearly I in Fig. 2) into the main air-chamber G,carrying all smoke and creating afiaming mass of fire in the lines right up to the branch pieces.

The air-elnnnber G is a pipe running down the center of the boiler and. out through the shell near the botlonl, as described in nlypatent dated ,lainnz'ny 24-, 1887, No. ZITfifiBZ.

The perforated plates mayhave a handle atand forward. for lhe purpose oi (leaning the tubes and removing the remains of eonlbnw tion.

I would have it nndersloml that I do not confine myself to lhe exaet details hereinbefore deserilmd, as some may he slighlly ai tered without d emu-ting from the spirit of my invention.

RIM IINAI, l) WALTER HEW E'F'l.

'W i ii] 1 esses:

(,i'EORUE \VATTREN, ALEX. LUSH. 

